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In which of the following reactions,stan...

In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s energy change`(DeltaG^(@))`decreases sharply with increasing temperature?

A

C graphite `+ (1)/(2) O_(2) (g) rarr CO(g)`

B

`CO(g) + (1)/(2) O_(2)(g) rarr CO_(2)(g)`

C

`Mg(s) + (1)/(2) O_(2) (g) rarr MgO(s)`

D

`(1)/(2)C` graphite `+ (1)/(2) O_(2)(g) rarr (1)/(2) CO_(2)(g)`

Text Solution

Verified by Experts

The correct Answer is:
A
In the first reaction `C(gr) + (1)/(2) O_(2)(g) rarr CO(g) Delta S^(@)=` +ve
Therefore `Delta G^(@)= Delta H^(@)- T Delta S` that means the value of `Delta G` decrease on increase temperature.
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